Electro-dynamic machine



(No Model.)

O. DAHL.

ELECTRO DYNAMIC MACHINE.

No. 499,099. Patented June 6, 1893.

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UNITED STATES PATENT OFFICE.

OLOF DAHL, OF PATERSON, NEW' JERSEY, ASSIGNOR TO THE DAHL ELECTRIC COMPANY, OF NEIY JERSEY.

ELECTRO-DYNAMIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 499,099, dated June 6, 1893.

Original application filed October 21, 1890, Serial No. 368,863. Divided and this application tiled April 22. 1893. Serial No. 471.418. (No model.)

T all whom it may concern: To the magnet core 7 are connected pole 5o Be it known that I, OLOF DAHL, a subject pieces 12, 14, attached at opposite ends of the of the King of Sweden and Norway, at present core so that the pieces 12 shall be of opposite residing in Paterson, State of New Jersey, polarity to the pieces 14. Similarly the maghave invented certain new and useful Imnet core Sis provided with corresponding pole provements in Electro-Dynamo Machines, of pieces 11,13 of opposite polarity. The two which the following is a specification. field magnets not only are concentric with the This application is a division of my applidriving shaft or axle, but as shown are symcation, Serial No. 368,863, filed by me October metrically situated with reference to the arro 21, 1890, in the United States Patent Oiice. mature. The two sets of pole pieces (of cor- The primary object of my invention is to responding polarity) project toward eachother 6o provide a type of electric motor that is suit and in fact abut so as to form consequent able to be placed l,directly on the driving axle poles. They are presented to the armature of such slow running machines as railway alternately in positive and negative order,

r 5 trucks, elevators, propellers, thc., without beand in the arrangement shown in Figs. 1 and ing too heavy or taking up too much space. 2 they are so arranged as to envelop or em- 65 To this end the invention consists in the brace the armature or its periphery. special arrangements of ield magnets, field The machine shown in Figs. 3 and4differs magnetic coils and armatures, hereinafter defrom that shown in Figs. 1 and 2 in the forzo scribed and claimed. mation of the pole pieces; in other respects In the drawings accompanying this specifithe two are substantially the same, the pole 7o cation Figure 1 is a longitudinal vertical secpieces of the two eld magnet cores of the tion of a motor and its connections embodysame polarity being placed opposite to and ing my invention. Fig. 2 is an end view of extending toward each other and being prez 5 the same motor as seen from the commutator sented to the armature in the same orderend, with the commutator, brush holders and that is alternately positive and negative. But one of the field magnets removed. Fig. 3 is in Figs. 3 and 4 the pole pieces 18 and 19 of a longitudinal vertical section of a modified the two field magnet cores which have one form of the motor. Fig. 4 is an end view of polarity abut and are securely doweled or 3o the motor last referred to, taken from the otherwise fastened together at their meeting commutator end in the same way as in Fig. 2. ends, and are (as in Fig. 1) placed so as to So Like reference numerals indicate correembrace or cover part of the outside surface sponding parts in all the figures. or periphery of the armature, while the pole In the drawings, referring now to the mapieces 2O and 21 of the otherpolarity are placed 35 chine shown in Figs. 1 and 2, 1 represents the opposite to and so as to cover part of the inmain or driving shaft, on which is placed a terior surface of the armature ring-the arcommutator 2 ofthe usual construction. The rangement in this last named respect differarmature core 3 is fixed -to the shaft 1 by ing from that illustrated in Figs. 1 and 2. means of the spider 4 the hub of which is fas- I have omitted representation of the com- 4o tened on the shaft. The armature may be of mutator brushes, as being too well known to the open or closed circuit type, and the wires require illustration. I have also omitted rep- 9o from the same are carried through the hub of resentation of the supporting frame for the the spider to the commutator in any ordinary working parts, as forming no part of the presor suitable manner. ent invention; this as well as the manner of 45 On bushings 5 and G and placed on oppomounting the motor in the frame will vary site sides of the spider 4 iit the magnet cores according to the use for which the motor is 95 7 and S which are concentric with the shaft; designed-*whether as a stationary motor or on them the exciting spools 9 and 10 are refor locomotive purposes. spectively wound. Vhile 1 have described my invention as emlIO lll

bodied in a motor, yet it is obvious that machines for the generation of electric currents can be made of the same type.

In conclusion I state that I do not here claim broadly the combination in an electric generator or motor of a ring orannular armature, and a field magnet whose pole pieces of alternately opposite polarity are arranged, those of one polarity on the inside, and those of the other polarity on the outside, of the armature, this among other things being the subject of my aforesaid application, Serial No. 368,863, of October 2l, 1890.

Vhat I here claim, and desire to secure by LettersA Patent, is-` l. In an electro-dynamo machine, Jthe combination of a shaft- 5 an armature affixed thereto; two field magnets concentric with the shaft and symmetrically situated with reference to the armature; magnetizing coils or windings on said field magnets also concentric with said shaft; pole pieces of one polarity extending from one end of the magnetizing coil of each magnet; and pole pieces of opposite polarity extending from the other end of the magnetizingcoil of each magnetthe pole pieces being alternately of opposite polarity and being so arranged that those of one polarity in the one magnet shall extend toward and meet those of corresponding polarity of the other magnet, and shall be presented in this order to the armature.

2. In an electro-dynamo machine, the combination of a shaft; an armature affixed thereto; two iield magnets concentric with the shaft and symmetrically situated with reference to the armature; magnetizing coils or windings on said field magnets also concentric with the shaft; two or more pole pieces of one polarity extending from one end of each magnet; and two or more pole pieces of opposite polarity extending from the other end of each magnet-the pole pieces of like polarity in the one magnet abutting against corresponding pole pieces of the other magnet, and embracing the exterior of the armature, to which they are presented in alternate order as regards polarity.

In testimony whereof Iaflix my signature in presence of two witnesses.

OLOF DAIII.

\Vitnesses:

J. M. CAMPBELL, FRANK B. CASE. 

